and Central American Malachiidae and Melyridae. 113 



Mexico or Central America, eight of which are described 

 as new, come very near some of the more feebly developed 

 Trichochrous, differing from them in the non-spinulose 

 slender tibiae. Amongst the N.-American representatives 

 there are several with variegate pubescence, or with the 

 elytra fasciate ; but in the forms here dealt with the pubes- 

 cence is uniform and entirely decumbent, the erect setae, 

 present in many Trichochrous, being invariably absent. 

 Two species of the present genus from the Ecuadorian 

 Andes were described by Gorham in 1891. 



Key to the Mexican and Central American species of 

 Listrus. 

 a. Antennae long, slender, the penultimate 

 joints (except in L. subcupreus) as 

 long as broad, the fifth very little 

 larger than the sixth. 

 a^. Anterior and intermediate tibiae of (J 

 strongly curved, sinuate within, and 

 toothed at apex, 

 a^. Fifth ventral segment of (^ deeply 

 excavate, and with two stout 

 horn-like processes, the apical 

 margin bearing a polished tubercle 

 in the middle : species elongate . suhcyaneus, Gorh. 

 b"^. Fifth ventral segment of (J flattened, 

 and without such processes. 

 o*. Fifth ventral segment of (^ with 

 a minute dentiform projection 

 in middle behind : species larger 

 and more elongate .... 

 6'. Fifth ventral segment simple : 

 species much smaller 

 b^. Anterior and intermediate tibiae of (J 

 not curved, the former toothed at 



apex 



b. Antennae much shorter, the penultimate 

 joints transverse, the fifth distinctly 

 larger than the sixth, 9-11 forming a 

 definite club, 

 c^. Prothorax gibbous, with the lateral 

 margins sharply crenulate; body 

 very shining, narrow, brassy; legs, 

 and antennae in part, red . . . crenicollis, n. sp. 

 TRANS. ENT. SOC. LOND. 1914. — PART I. (juNE) I 



cupreonitens, Gorh. 

 subcupreus, n. sp. 



flavicornis, n. sp. 



